Disk Activity Warning; Figure 6-7 Energy Direction Convention - Siemens 7SR10 Argus Series Manual

180°
ACTIVE ENERGY IMPORT
(watts reverse)
IEC CONVENTION : -ve watts
Setting either the Export Power (W) or Lag VAr (VAr) to be -ve, will reverse the Direction of the Energy transfer
for these quantities. So forward VAr will then be reported as Imported Reactive Energy, and forward Watts will be
reported as Exported Active Energy.
When the accumulated Energy quantities reach a set increment, the Relay issues a pulse to the binary outputs:
OUTPUT CONFIG/OUTPUT MATRIX> Active Exp Pulse, Active Imp Pulse, Reactive Exp Pulse and Reactive
Imp Pulse.
The Energy increments are set by the settings: DATA STORAGE/ENERGY STORAGE> Active Exp Energy
Unit, Active Imp Energy Unit, Reactive Exp Energy Unit and Reactive Imp Energy Unit. These setting also
define the resolution of the stored energy values reported by instruments and communications protocols. The
value is stored in the range 0-999999 which continues from zero automatically when 999999 is reached.

6.3.7 Disk Activity Warning

The Data Storage facilities offered by the Relay involve archiving a huge amount of data to non-volatile memory.
Since such functionality is always secondary to the Protection functionality offered by the Relay, this means that
data transfers can take significant amounts of time; perhaps several minutes. If the Relay is power-cycled during
a storage cycle, some of the data will be lost. For this reason, the Relay can provide a visual warning (at the top-
right position of the LCD) that data storage is taking place:
The 'œ' disk symbol shows that the copying of Events, Waveform Records or Fault Records, to non volatile disk
storage, is currently in progress.
Whether this symbol is displayed or not is set by the SYS CONFIG > Disk Activity Symbol setting.
To avoid such data archiving causing a sluggish response of the HMI during Testing or Commissioning – when a
considerable number of new Data records are likely to be created – it is possible to temporarily suspend it. The
duration of this block is set by the SYS CONFIG > Archiver Blocking Time setting. Once this Time has elapsed,
the block is removed and all stored data will be archived as usual.
The 'A' symbol at the top-right position of the LCD indicates that new Events, Waveform Records or Fault
Records are currently being held in volatile RAM and the archiving, to non-volatile flash disk storage, is being
temporarily blocked.
©2018 Siemens Protection Devices Limited
REACTIVE ENERGY IMPORT
(vars reverse)
IEC CONVENTION : -ve vars
+90°
POWER FACTOR LAGGING POWER FACTOR LEADING
ACTIVE (W) IMPORT ACTIVE (W) EXPORT
REACTIVE (VAr) IMPORT REACTIVE (VAr) IMPORT
POWER FACTOR LEADING POWER FACTOR LAGGING
ACTIVE (W) IMPORT ACTIVE (W) EXPORT
REACTIVE (VAr) EXPORT REACTIVE (VAr) EXPORT
-90°
REACTIVE ENERGY EXPORT
(vars forward)
IEC CONVENTION : +ve vars
Figure 6-7 Energy Direction Convention
7SR10 Description of Operation
0°
ACTIVE ENERGY EXPORT
(watts forward)
IEC CONVENTION : +ve watts
Chapter 1 Page 74 of 77